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Subject: media: dvb: i2c transfers over usb cannot be done from stack
Author:  Laurent Caumont <[email protected]>
Date:    Sat Nov 11 12:44:46 2017 -0500

Cc: [email protected]
Signed-off-by: Laurent Caumont <[email protected]>
Signed-off-by: Sean Young <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

 drivers/media/usb/dvb-usb/dibusb-common.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

---

diff --git a/drivers/media/usb/dvb-usb/dibusb-common.c 
b/drivers/media/usb/dvb-usb/dibusb-common.c
index 8207e6900656..bcacb0f22028 100644
--- a/drivers/media/usb/dvb-usb/dibusb-common.c
+++ b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -223,8 +223,20 @@ EXPORT_SYMBOL(dibusb_i2c_algo);
 
 int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val)
 {
-       u8 wbuf[1] = { offs };
-       return dibusb_i2c_msg(d, 0x50, wbuf, 1, val, 1);
+       u8 *buf;
+       int rc;
+
+       buf = kmalloc(2, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
+       buf[0] = offs;
+
+       rc = dibusb_i2c_msg(d, 0x50, &buf[0], 1, &buf[1], 1);
+       *val = buf[1];
+       kfree(buf);
+
+       return rc;
 }
 EXPORT_SYMBOL(dibusb_read_eeprom_byte);
 

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